11  * ??-12-1998: Initial implementation.
12  * 31-01-1999: Make port-cloning transparent.
13  * 13-02-1999: Move DeviceID technique from parport_probe.
14  * 13-03-1999: Get DeviceID from non-IEEE 1284.3 devices too.
15  * 22-02-2000: Count devices that are actually detected.
24 #include <linux/delay.h>
44 /* Forward-declaration of lower-level functions. */
56 		newdev->port = port;  in add_dev()
57 		newdev->daisy = daisy;  in add_dev()
58 		newdev->devnum = devnum;  in add_dev()
60 		for (p = &topology; *p && (*p)->devnum<devnum; p = &(*p)->next)  in add_dev()
62 		newdev->next = *p;  in add_dev()
71 	struct parport *extra = parport_register_port(real->base,  in clone_parport()  local
72 						       real->irq,  in clone_parport()
73 						       real->dma,  in clone_parport()
74 						       real->ops);  in clone_parport()
75 	if (extra) {  in clone_parport()
76 		extra->portnum = real->portnum;  in clone_parport()
77 		extra->physport = real;  in clone_parport()
78 		extra->muxport = muxport;  in clone_parport()
79 		real->slaves[muxport-1] = extra;  in clone_parport()
82 	return extra;  in clone_parport()
87 	struct device_driver *drv = par_dev->dev.driver;  in daisy_drv_probe()
89 	if (strcmp(drv->name, "daisy_drv"))  in daisy_drv_probe()
90 		return -ENODEV;  in daisy_drv_probe()
91 	if (strcmp(par_dev->name, daisy_dev_name))  in daisy_drv_probe()
92 		return -ENODEV;  in daisy_drv_probe()
102 /* Discover the IEEE1284.3 topology on a port -- muxes and daisy chains.
132 	 * we don't have to claim exclusive access.  */  in parport_daisy_init()
135 	 * parports for each extra port. */  in parport_daisy_init()
136 	if (port->muxport < 0 && mux_present(port) &&  in parport_daisy_init()
140 		port->muxport = 0;  in parport_daisy_init()
141 		pr_info("%s: 1st (default) port of %d-way multiplexor\n",  in parport_daisy_init()
142 			port->name, num_ports);  in parport_daisy_init()
145 			struct parport *extra = clone_parport(port, i);  in parport_daisy_init()  local
146 			if (!extra) {  in parport_daisy_init()
154 			pr_info("%s: %d%s port of %d-way multiplexor on %s\n",  in parport_daisy_init()
155 				extra->name, i + 1, th[i + 1], num_ports,  in parport_daisy_init()
156 				port->name);  in parport_daisy_init()
158 			/* Analyse that port too.  We won't recurse  in parport_daisy_init()
159 			   forever because of the 'port->muxport < 0'  in parport_daisy_init()
161 			parport_daisy_init(extra);  in parport_daisy_init()
165 	if (port->muxport >= 0)  in parport_daisy_init()
172 	add_dev(numdevs++, port, -1);  in parport_daisy_init()
177 		if (parport_device_id(numdevs - 1, deviceid, 1024) > 2)  in parport_daisy_init()
210 		if (dev->port != port) {  in parport_daisy_fini()
211 			p = &dev->next;  in parport_daisy_fini()
214 		*p = dev->next;  in parport_daisy_fini()
227  *	parport_open - find a device by canonical device number
250 	while (p && p->devnum != devnum)  in parport_open()
251 		p = p->next;  in parport_open()
258 	daisy = p->daisy;  in parport_open()
259 	port = parport_get_port(p->port);  in parport_open()
267 	dev->daisy = daisy;  in parport_open()
273 		selected = port->daisy;  in parport_open()
287  *	parport_close - close a device opened with parport_open()
299 /* Send a daisy-chain-style CPP command packet. */
317 		pr_debug("%s: cpp_daisy: aa5500ff(%02x)\n", port->name, s);  in cpp_daisy()
318 		return -ENXIO;  in cpp_daisy()
327 		pr_debug("%s: cpp_daisy: aa5500ff87(%02x)\n", port->name, s);  in cpp_daisy()
328 		return -ENXIO;  in cpp_daisy()
345 /* Send a mux-style CPP command packet. */
363 			 port->name, cmd, s);  in cpp_mux()
364 		return -EIO;  in cpp_mux()
384 		// For these modes we should switch to EPP mode:  in parport_daisy_select()
391 		// For these modes we should switch to ECP mode:  in parport_daisy_select()
423 	int muxport = port->muxport;  in select_port()
448 		pr_debug("%s: assign_addrs: aa5500ff(%02x)\n", port->name, s);  in assign_addrs()
458 		pr_debug("%s: assign_addrs: aa5500ff87(%02x)\n", port->name, s);  in assign_addrs()
486 		/* We are seeing pass through status now. We see  in assign_addrs()
488 		   work status lines from some non-daisy chain  in assign_addrs()
494 	detected = numdevs - thisdev;  in assign_addrs()
495 	pr_debug("%s: Found %d daisy-chained devices\n", port->name, detected);  in assign_addrs()